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The substance, CoCl2, is useful as a humidity indicator because it changes from pale blue to pink as it gains water from moist air. What is its name?
Principle
A fundamental truth, law, doctrine, or motivating force, upon which others are based or derived.
Relative Motion
The movement of an object in relation to another object, considering both of their movements in a specific frame of reference.
Shape Constancy
The sensory experience in which an object's observed shape stays the same, even when the perspective or distance from which it is seen changes.
Size Constancy
A perceptual phenomenon in which the perceived size of an object remains constant despite changes in the distance from which it is observed.
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